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b536b4b9 JF |
1 | /* |
2 | * xen console driver interface to hvc_console.c | |
3 | * | |
4 | * (c) 2007 Gerd Hoffmann <kraxel@suse.de> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
21 | #include <linux/console.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/err.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/types.h> | |
26 | ||
27 | #include <asm/xen/hypervisor.h> | |
28 | #include <xen/page.h> | |
29 | #include <xen/events.h> | |
30 | #include <xen/interface/io/console.h> | |
31 | #include <xen/hvc-console.h> | |
32 | ||
33 | #include "hvc_console.h" | |
34 | ||
35 | #define HVC_COOKIE 0x58656e /* "Xen" in hex */ | |
36 | ||
37 | static struct hvc_struct *hvc; | |
38 | static int xencons_irq; | |
39 | ||
40 | /* ------------------------------------------------------------------ */ | |
41 | ||
6b9b732d JF |
42 | static unsigned long console_pfn = ~0ul; |
43 | ||
b536b4b9 JF |
44 | static inline struct xencons_interface *xencons_interface(void) |
45 | { | |
6b9b732d JF |
46 | if (console_pfn == ~0ul) |
47 | return mfn_to_virt(xen_start_info->console.domU.mfn); | |
48 | else | |
49 | return __va(console_pfn << PAGE_SHIFT); | |
b536b4b9 JF |
50 | } |
51 | ||
52 | static inline void notify_daemon(void) | |
53 | { | |
54 | /* Use evtchn: this is called early, before irq is set up. */ | |
55 | notify_remote_via_evtchn(xen_start_info->console.domU.evtchn); | |
56 | } | |
57 | ||
58 | static int write_console(uint32_t vtermno, const char *data, int len) | |
59 | { | |
60 | struct xencons_interface *intf = xencons_interface(); | |
61 | XENCONS_RING_IDX cons, prod; | |
62 | int sent = 0; | |
63 | ||
64 | cons = intf->out_cons; | |
65 | prod = intf->out_prod; | |
66 | mb(); /* update queue values before going on */ | |
67 | BUG_ON((prod - cons) > sizeof(intf->out)); | |
68 | ||
69 | while ((sent < len) && ((prod - cons) < sizeof(intf->out))) | |
70 | intf->out[MASK_XENCONS_IDX(prod++, intf->out)] = data[sent++]; | |
71 | ||
72 | wmb(); /* write ring before updating pointer */ | |
73 | intf->out_prod = prod; | |
74 | ||
75 | notify_daemon(); | |
76 | return sent; | |
77 | } | |
78 | ||
79 | static int read_console(uint32_t vtermno, char *buf, int len) | |
80 | { | |
81 | struct xencons_interface *intf = xencons_interface(); | |
82 | XENCONS_RING_IDX cons, prod; | |
83 | int recv = 0; | |
84 | ||
85 | cons = intf->in_cons; | |
86 | prod = intf->in_prod; | |
87 | mb(); /* get pointers before reading ring */ | |
88 | BUG_ON((prod - cons) > sizeof(intf->in)); | |
89 | ||
90 | while (cons != prod && recv < len) | |
91 | buf[recv++] = intf->in[MASK_XENCONS_IDX(cons++, intf->in)]; | |
92 | ||
93 | mb(); /* read ring before consuming */ | |
94 | intf->in_cons = cons; | |
95 | ||
96 | notify_daemon(); | |
97 | return recv; | |
98 | } | |
99 | ||
100 | static struct hv_ops hvc_ops = { | |
101 | .get_chars = read_console, | |
102 | .put_chars = write_console, | |
611e097d CB |
103 | .notifier_add = notifier_add_irq, |
104 | .notifier_del = notifier_del_irq, | |
fc362e2e | 105 | .notifier_hangup = notifier_hangup_irq, |
b536b4b9 JF |
106 | }; |
107 | ||
108 | static int __init xen_init(void) | |
109 | { | |
110 | struct hvc_struct *hp; | |
111 | ||
6e833587 JF |
112 | if (!xen_pv_domain() || |
113 | xen_initial_domain() || | |
6b9b732d JF |
114 | !xen_start_info->console.domU.evtchn) |
115 | return -ENODEV; | |
b536b4b9 JF |
116 | |
117 | xencons_irq = bind_evtchn_to_irq(xen_start_info->console.domU.evtchn); | |
118 | if (xencons_irq < 0) | |
6b9b732d JF |
119 | xencons_irq = 0; /* NO_IRQ */ |
120 | ||
b536b4b9 JF |
121 | hp = hvc_alloc(HVC_COOKIE, xencons_irq, &hvc_ops, 256); |
122 | if (IS_ERR(hp)) | |
123 | return PTR_ERR(hp); | |
124 | ||
125 | hvc = hp; | |
6b9b732d JF |
126 | |
127 | console_pfn = mfn_to_pfn(xen_start_info->console.domU.mfn); | |
128 | ||
b536b4b9 JF |
129 | return 0; |
130 | } | |
131 | ||
6b9b732d JF |
132 | void xen_console_resume(void) |
133 | { | |
134 | if (xencons_irq) | |
135 | rebind_evtchn_irq(xen_start_info->console.domU.evtchn, xencons_irq); | |
136 | } | |
137 | ||
b536b4b9 JF |
138 | static void __exit xen_fini(void) |
139 | { | |
140 | if (hvc) | |
141 | hvc_remove(hvc); | |
142 | } | |
143 | ||
144 | static int xen_cons_init(void) | |
145 | { | |
6e833587 | 146 | if (!xen_pv_domain()) |
b536b4b9 JF |
147 | return 0; |
148 | ||
149 | hvc_instantiate(HVC_COOKIE, 0, &hvc_ops); | |
150 | return 0; | |
151 | } | |
152 | ||
153 | module_init(xen_init); | |
154 | module_exit(xen_fini); | |
155 | console_initcall(xen_cons_init); | |
156 | ||
0922abdc JF |
157 | static void raw_console_write(const char *str, int len) |
158 | { | |
159 | while(len > 0) { | |
160 | int rc = HYPERVISOR_console_io(CONSOLEIO_write, len, (char *)str); | |
161 | if (rc <= 0) | |
162 | break; | |
163 | ||
164 | str += rc; | |
165 | len -= rc; | |
166 | } | |
167 | } | |
168 | ||
169 | #ifdef CONFIG_EARLY_PRINTK | |
b536b4b9 JF |
170 | static void xenboot_write_console(struct console *console, const char *string, |
171 | unsigned len) | |
172 | { | |
173 | unsigned int linelen, off = 0; | |
174 | const char *pos; | |
175 | ||
0922abdc JF |
176 | raw_console_write(string, len); |
177 | ||
83abc70a | 178 | write_console(0, "(early) ", 8); |
b536b4b9 JF |
179 | while (off < len && NULL != (pos = strchr(string+off, '\n'))) { |
180 | linelen = pos-string+off; | |
181 | if (off + linelen > len) | |
182 | break; | |
183 | write_console(0, string+off, linelen); | |
184 | write_console(0, "\r\n", 2); | |
185 | off += linelen + 1; | |
186 | } | |
187 | if (off < len) | |
188 | write_console(0, string+off, len-off); | |
189 | } | |
190 | ||
191 | struct console xenboot_console = { | |
192 | .name = "xenboot", | |
193 | .write = xenboot_write_console, | |
0922abdc | 194 | .flags = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME, |
b536b4b9 | 195 | }; |
0922abdc | 196 | #endif /* CONFIG_EARLY_PRINTK */ |
0acf10d8 JF |
197 | |
198 | void xen_raw_console_write(const char *str) | |
199 | { | |
0922abdc | 200 | raw_console_write(str, strlen(str)); |
0acf10d8 JF |
201 | } |
202 | ||
203 | void xen_raw_printk(const char *fmt, ...) | |
204 | { | |
205 | static char buf[512]; | |
206 | va_list ap; | |
207 | ||
208 | va_start(ap, fmt); | |
209 | vsnprintf(buf, sizeof(buf), fmt, ap); | |
210 | va_end(ap); | |
211 | ||
212 | xen_raw_console_write(buf); | |
213 | } |